slider



W. T. AND H. R. SLIDER.

. MICROMETER.

APPLICATION FILED IAII.5. I92I.

l, 1 ,O l 6 Patehed Sp. 20, 1921.

VIIIIJ.

UNITED STATES PATENT OFFICE."

WILLIAM T. SLIDER AND HAROLD R. SLIDER, OF INDIANAPOLIS, INDIANA.

MIGROMETER.

Application filed January 5, 1921.

To all whom it may concern:

Be it known that we, WILLIAM T. SLIDER and HAROLD R. SLIDER, citizens of the United States, residing at Indianapolis, in the county of Marion and State ofIndiana, have' invented new and useful Improvements in Micrometers, of which the following is av seen and serve as a check to the workman.

i gage with our invention applied as an attachment. Fig. 2 is a view'of same on a quarter turn from Fig. 1. Fig. 3, shows a fragment in side elevation like Fig. 1, with our attachment in section.l Fig. 4 is a cross section onthe line 4 4 of Fig. 3. Fig. 5 is a modified form of our device and Fig. 6 shows the application of our invention to an inside micrometer caliper.

Like characters of reference indicate like parts in the several yviews ofthe drawing.

For purposes of illustration we have shown our invention as applied to a caliper of well known construction in which the A frame 7 has an anvil r8 at one end, and a sleeve 9 at the'other with Van internally threaded opening through which a screwthreadedspindle 10 passes and is rotated by manipulating a knurled end 11 to change its l distance from `the anvil. The end 11 has a sleeve 12 with a beveled and graduatedrend 13 which has conjoint use with a scale as shown on sleeve 9.

-Our invention includes an internally threaded cylindrical ring 14, which is as sembled around the sleeve 12, as shown and is retainedimmovably, or with capacity for rotary adjustment, by 'an expansion bush 15 threaded to screw into the ring. The outside of the rin is graduated with.r a suitable scale 16, exten ing circumferentially of the ring,

and itis also provided with a circumferential channel inwhich a diagonally split spring- Specication of Letters Patent.

Patented Sept. 20, 1921.

Serial No. 435,078.

tempered ring 17 is seated with adjustment of rotation therein. The ring 17 may be otherwise split for its assembly but we prefer the diagonal as causing less confusion with the graduations of an annular scale 18 on the ring 17. The frictional fit of this gage-ring l r in its channel is close enough to hold any given adjustment of the ring.

A companion part of our invention is an index-blade 19, bearing suitable graduations 20, and having, preferably, a stem 21 ad# j ustably heldin a block 22. The latter has a suitable hole to receive said shank and the adjustment of the shank therein is held by set screws 28. A rotary and also a longitudinal adjustment of the shank is thus'V obtained.

The block 22 is shown in Figs. 1 and 2 as secured to the frame 7 by plate 24, and screws 25,- forming a clamp, but in Fig. 5 it is shown as an integral part of the framethe probable lpreferred construction where our invention is planned for in the initial manufacture 0f the micrometer caliper; but where our invention is produced as an attachment for calipers already made thev clamp will be preferable. j j l The use of our device for easy and yet more accurate reading of micrometer calipers is as follows: First, close the micrometer to minimum or zero on barrel 9; thenrevolve ring 14, withthe micrometer still atA Zero, until the zero of scale 16 onfring 14, registers withthe knife-edge of index-blade '19, and grip firmly to sleeve 12 by tightening the expansion bush 15 in ring'14 without moving the latter. beveled end 13 of the thimble 12 may now be ignored because the enlarged scale on ring 14 answers the` same purpose, but` with the amount of error, if any, magnified and therefore more visible.

Finally, adjust the zero line on index blade 19, to register with the center linea of ring-scale 16, and the micrometer is ready to read byour method, the readings of the yoriginal calipers being ignored-if desired,

but not ofl necessity so, as our attachment and method of reading do not obscure any Vpart of the original 'scales and index, nor interfere with the use of the caliper for an other measurements 'desired with it. r

The scale on the 40 y and sleeve 9 of the micrometer, and it will The use of the limit-gage ring 17, carried by the ring 14, is as follows:

Set the micrometer to the finished size of the piece to be measured, for instance at .200,

and, taking for example, a limit of plus .002, and minus .003, set the caliper at .200 and holding the thimble 11 in the usual way in the right hand, with thumb and finger of the left hand revolve the gage-ring 17 until zero on it comes in register with the .200 mark of the scale or desired finished size.

Then, if a piece of work be placed between ltothe left of .200 on ring 14 when ring 17 is moved from right to left, is minus, and that comes to the right of .200 when 17 is moved from left to right, is plus. Thus it will be seen that the maximum plus or minus reading of the instrument with our invention is only limited by the capacity of the caliper and that any variation from standard finished size will be quickly noticeable.

If desired the ring-scale 16 may be used A as alimit-gage byV leaving the expansionbush at such a tension as will permit the rotary adjustment of the ring 14 about the thimble 12 of the micrometer. Then set the caliperto the desired finished size with the zero on the ring 14 set to Vregister with the desired finished size as shown on thimble 12 be found that any variation of zero on ringscale v16 from .200 (or the previously de- .Y termined finished size) will be plus or minus,

and shown on the enlarged scale. Thus an operator using the invention for sizing on production work can always have a warning zero in large type before him if he has set his Zero atplus orminus, according to his needs.

vIn the modification'shown in Fig. 5, the block 22 is formed integrally with Vthe frame 7 and the blade 19 is elongated sufficiently toy receive the whole length of the scale 20 taking the place ofthe scale usually found on sleeve 9. In this embodiment of our invention the gage-ring 17 is located at the middlel 0f vring 14 and the scale on the latter is on either side of the ring 17 In the adaptation of ou-rl invention to inside calipers as shown in Fig. 6, a splits sleeve clamp 8,0 is placed on the sleeve 31 4andheld by set screws 82 at desired place.

While we have shown the best embodiment of our invention now known to us the elements thereof are capable of numerous variations in form and means of attachment and assembly and we d0 not desired to be limited any more than is required by the appended claims.

Having thus fully described our invention what we claim as new, is-

1. A micrometer gage frame having a graduated sleeve, a spindle adjustably mounted in the sleeve and having a sleeve with an index scale coperating with the graduations of the sleeve on the frame, a graduated ring adjustably mounted on and surrounding the sleeve of the spindle and having a circumferential scale, a second graduated ring adjustably mounted on the first ring, and an index blade mounted on the frame and coperating with both graduated rings vvithout obscuring the graduations of the sleeve on the frame or the index scale of the sleeve of the spindle.

2. A micrometer gage frame having a graduated sleeve, a spindle adjustably mounted on the sleeve and having a sleeve with an index scale coperating withthe graduations of the sleeve 0n the frame, a graduated ring surrounding the sleeve on `the spindleand having a circumferential scale, an expansion bush between the ring and the sleeve on the spindle, and an index blade mounted on the frame and coperating with the graduated ring.Y Y

3. A micrometer gage having, in combination, a frame, a micrometer spindle adjustably mounted in the frame, a graduated ring surrounding thel spindle, an expansion bush between the ring and spindle, and an index blade mounted on the frame and cooperating with the graduated ring.

y4. A micrometer gage having, vin combination, a frame, va micrometer spindle adjustably mounted in the frame, the Yspindle and framebeing provided with index and scale, respectively, a Vgraduated ring sur'-, rounding the spindle, an expansion bush to determine the rotary adjustment between the ring and spindle, and an indexblade mounted on the frame and coperating with the graduated ring without obscuring the' index and scale ofthe spindle and frame.

5. A micrometer gage having, in combination, a frame, a micrometer spindle adjustably mounted in the frame, a graduated ring adjustably surrounding `the spindle, a second graduated ring adjustably surrounding the first ring, and an index blade mounted on the Yframe and coperating with one 'orv both of the graduated rings.

V6. A micrometer gage having, in combi-n nation, a frame, a micrometer spindle adjustably mounted in the frame, a graduated ring adjustably mounted around thespindle said ring having a'circumferentialv channel, a second graduated ring adjustably mounts ed in the channel of the first ring, means for controlling the adjustment of the first ring, an index blade adjustably mounted on the frame and coperating with one or both of the graduated rings and means for holding an adustment of the blade.

7 micrometer gage having, in combination, a frame, a micrometer spindle adjustably mounted in the frame, a ring having circumferential graduations and a circumferential channel, said ring surrounding the spindle, an expansion bush regulating the adjustment of the ring about the spindle, a second circumferentially graduated ring adj ustably mounted in the channel of the first ring, an index blade adjustably mounted on the frame said blade having graduations and coperating with one or both of the graduated rings, and means for holding an adjustment of the blade.

Signed at Indianapolis, Indiana, this the 1st day of January, 1921. Y

WILLIAM T. SLIDER. HAROLD R. SLIDER. 

